When it's under Errors, you must fix it before being able to NETFILE, or you won't be eligible to use this option.
For now, CRA is asking everyone with Gains/Losses to wait before using NETFILE, because some details in some forms can create error or even amounts not being reported properly.
We have updates planned for this week. We will inform you in this thread as soon as we can.
Thank you for your patience.
